As Britain’s death toll from Covid-19 passes 100,000, there is one burning question: why did so many have to die? Tom Clark, Gaby Hinsliff and Philip Ball chart the persistent failures—from both the chief scientists and the politicians. Former head of the Supreme Court Brenda Hale takes on the human rights sceptics and Rana Mitter asks whether China's grip on Hong Kong means the end of the historic freedoms in the city.
Desalination—the removal of salt from seawater to make it drinkable —has long been a possible answer to the world's water shortages. Can technological advances bring it into the mainstream, or will it remain too expensive and energy-inefficient?
Nanotechnology-science that operates at the molecular level- has been threatening to become the "next big thing" for several years. But now it really is set to take off and products deriving from it will soon be changing everyday life